I have the 5 man tent. I had it set up in my backyard last winter for 3 months. It held up well. Towards spring when it rained the wet did not soak through the whole thing. It did wick into the liner a foot or so at some of the points where the liner attached.
My 10"x10"x22" wood stove kept it heated. I'd have to keep knocking the snow off it and having to shovel it away from the sides.
They are HEAVY. 55 pounds just the tent and liner. Throw in the pole, pegs ( snow pegs are steel) and pack and it is up to 85 pounds. You car camp or toboggan it. You would use it for a group outing so someone else can drag it while others drag the other equipment. They are also a cave inside as any military tent is so some source of light is always needed.
My boss used to be in armour and used them in the Canadian Forces. They were heated with a Coleman lantern. Sometimes the trooper on watch would fill the lantern inside the tent instead of outside. A flare up would set the tent on fire and they go up fast. Every excercise they burned one down and lost all the tent contents. They are no more flamable that other tents. They burned because of careless, overtired troops.
In winter they should camp and sleep 3 very comfortably. I use my army cot in mine.
The pole can be a pain to erect. It is a 3 section extendable type. I drilled mine in the extended position and made 3/8" steel pins to hold it up. It is a much more solid arrangement then. I made a wood base to put the pole in. I cut some long poles to hang it from to eliminate the centre pole for more room but haven't tried it out yet.
In short, I like mine.